Different levels of translucency allow you to choose between HT and LT to fabricate a highly esthetic porcelain-fused zirconia restoration with minimum laboratory effort. Porcelain-fused zirconia restorations tend to have a thin framework; their appearance may be affected by the color of the abutment. Select HT if you want to reflect the color of the abutment; select LT if you want to mask the color of the metal or discolored abutment. These options make it easier to achieve an esthetic color adjustment.